Restricted foot valve?

Old 10-22-21, 11:11 PM
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Restricted foot valve?

I have a Little Giant shallow well jet pump connected to a 1000 gallon rain water tank. The foot valve is located about 6 inches above the bottom of the tank to avoid debris. When the installation was new the pump built pressure in a 20 gallon bladder tank very quickly. Now it runs much longer to reach cutoff pressure. I have completely rebuilt the pump but still have the problem. I suspect there may be sufficient debris in the bottom of the tank to interfere with water flow. Is there a way to test this theory short of digging up the tank to inspect the space? Will such a pump cavitate and make a noise if restricted? Would I be smart to tap a hole in the suction pipe and attack a suction gage?

Last edited by JoeYoder; 10-22-21 at 11:13 PM. Reason: typos

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